Question: At a temperature of 20.0, what is the density of tin?
Paraphrase: What is tin's density when the temperature is 20.0?
SPARQL (Wikidata): SELECT ?obj WHERE { wd:Q1096 p:P2054 ?s . ?s ps:P2054 ?obj . ?s pq:P2076 ?x filter(contains(?x , '20.0')) }